Finding the Fourth Proportional to 1,349.42, 1,861.58 and 789.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,349.42 : 1,861.58 = 789.92 : x
2. Step 2: Convert to fraction form
   1,349.42/1,861.58 = 789.92/x
3. Step 3: Cross multiply
   1,349.42x = 1,861.58 × 789.92
4. Step 4: Simplify right side
   1,349.42x = 1,470,499.27
5. Step 5: Solve for x
   x = 1,470,499.27/1,349.42
6. Step 6: Final answer
   x = 1,089.73